Sand-blast machine.



J. L. DAWES.

SAND BLAST MACHINE.

APPLICATION FILED JAN-28. 19m.

Patented 001;. 10, 1916.

2 SHEETSSHEET l.

NVENTOR WITNESSES d w-qwmi J. L. DAWES.

SAND BLAST MACHINE.

APPLlCATION FILED mmza. I916.

Patented Oct. 10, 1916.

2 SHEETS-SHEET 2.

INVENTOR 2 WITNESSES YNE "men's PETERS m" FNBID Inna. -VASMINGTDN. n, c.

JOHN L. DAWES, OF PITTSBURGH, PENNSYLVANIA.

SAND-BLAST MACHINE.

Specification of Letters Patent.

Patented Oct. 10, 1916.

Application filed January 28, 1916. Serial No. 74,821.

To all whom it may concern Be it known that I, JOHN L. DAWES, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, a citizen of the United States, have invented or discovered'certain new and useful Improvements in Sand-Blast Machines, of which improvements the following is a specification.

The object of my invention is to provide a sand blast machine whereby lamp globes and like relatively small articles may be rapidly and effectively sand blasted, and which in service will not be rapidly worn out. 1

In the accompanying sheets of drawings, which form part of my specification, I have illustrated the preferred embodiment of my invention.

Figure 1 is a side elevation of the machine; Fig. 2 a sectional view taken on the broken line IIII, Fig. 1; Fig. 3 a sectional view taken on the line III-III, Fig. 2; Fig. 4 a detail sectionalview to enlarged scale taken on the line IVIV, Fig. 3; Fig. 5 a sectional view taken on the line VV, Fig. 4; and Fig. 6 a plan View of a detachable blank-supporting member.

In the practice of my invention I provide a closed casing, and, through the top thereof, suspend a horizontally-reciprocatory frame adapted to support blanks to be sand blasted. On each side of such blank support I provide a sand blast nozzle adapted to be reciprocated vertically simultaneously with, but at greater speed than, the horizontal reciprocation of the blank support. The mechanism for effecting the reciprocations of the support and nozzles is suitably coordinated to accomplish this relative variation in speed, and is arranged outside of the casing so that its bearing parts may not be ground or otherwise prejudicially aflected by the sand.

In the embodiment of my invention illustrated in the drawings, the casing has vertical sides 1 and 1*, ends 2 and 2 and a horizontal top 3. Mounted on the top 3 there is a frame 4, to one side of which there is attached a track consisting of a channel 5 and angles 6, such track being adapted to receive a T-shaped slide member 7 The blank supporting frame is suspended from this member and consists of hangers or rods 8, secured at their upper ends to such member, and a horizontal shelf 9 attached to the lower ends of the rods. As will be seen the top of the casing is provided with a slot 10, through which the hangers 8 extend, and, to prevent dust from escaping through this slot, suitable strips 11 of felt or other flexible material are attached to the casing adjacent to the slot. That Various sized globes or other articles may be properly supported on the shelf 9, its upper face, as shown particularly in Figs. 1 and 5, is provided with a rib 12 adapted to hold a board 13 provided with suitable holes 14:, it being understood that any one of a number of such boards, having different sized and arranged holes, may be placed upon the shelf 9. In Figs. 1 to 5, inclusive, the board 13 is provided with two holes, while in Fig. 6 there is shown a board having four holes adapted to receive four globes of smaller size than those shown in Figs. 2 and 3.

The reciprocation of the blank-supporting frame is efl'ected by means of a pitman 15, secured at one end to the slide member 7, and at its other end eccentrically attached to a rotary drum 16. A power shaft 17, driven by a belt 18,is mounted on the top of the casing, and, through pulley 19 and belt 20,

drives the drum 16. That the throw or range of reciprocation of the blank supporting frame may be varied, the drum is provided with a series of holes 21 for connecting the pitman to it at different distances from its center.

As already stated, a sand blast nozzle is arranged for vertical reciprocation at each side of the horizontally reciprocatory blank support. These nozzles, indicated at 22 and 22*, may be of any suitable construction. They are fed by flexible air supply p pes 23 and 23 and flexible sand supply pipes 24 and 24*- having suitable sand receptacles or filters 25 and 25 secured to their lower ends, such filters lying in sand bins 26 and 26*. Since the mechanism for reciprocating each nozzle is the same, it will only be necessary to describe that for reciprocating the nozzle 22. As will be seen, this nozzle is secured to a pipe 27, which extends through a suitable slot 33 formed in the side 1 of the casing, and is attached to a carrier 28 slidably mounted on a guide 29 secured to the casing. The carrier is reciprocated by a pltman 30 adjustably connected to a wheel 31 secured to the endof power shaft 17, and, to reduce the friction of the carrier upon the guide 29, the carrier is provided with 1 01-, lers 32. Furthermore, to prevent dust and sand particles from escaping from the casing through the slot 33, the carrier 28 has secured to it an elongate plate 34: adapted to move with the carrier and at all positions thereof to close the slot.

As already stated, the mechanism for reciprocating the nozzle 22 is the same as that just explained for the nozzle 22, the pitman 30 for the nozzle-22 being attached to a wheel 31 at the other end of the power shaft 17. That the spent sand issuing from the nozzles may be easily removed from the casing, the end 2 thereof is provided, at its bottom and between the sand bins 26 and 26 with a sliding door 35, and an inclined floor or chute 37 extends rearwardly and upwardly from such door. Thus the sand falling upon the chute will pile up in front of the door and may be removed at any time without stopping the operation of the machine.

In the operation of the machine it is first necessary to arrange and adjust it to properly and economically'sand blast blanks of the size desired to be operated upon. F or this purpose a board 13 having the required number of holes 14, such holes also being of the proper size to receive the blanks, is placed upon the shelf 9, the range of reciprocation of the nozzles is adjusted to correspond with the height of the blanks, and the range of reciprocation of the shelf is adjusted to correspond with the outside horizontal dimension of the series of blanks. The reciprocating mechanism is then set in operation, the shelf being moved to and fro horizontally at a much slower speed than the vertical movements of the nozzles. Thus both sides of the blanks are simultaneously sand blasted in a minimum space of time.

According to the provisions of the patent statutes, I have described the principle and operation of my invention together with the machine which now I consider to represent the best embodiment thereof. However, I desire it understood that the machine shown is only illustrative, and that my invention may be practised by other forms of ma ehines.

I claim as my invention:

1. In a sand blast machine, the combination of a closed casing, a horizontally-reciproeatory frame extending through the top thereof, a blank-supporting shelf secured to said frame within the casing, a vertically-reciprocatory sand blast nozzle at each side of said shelf, and coordinated mechanism for reciprocating said shelf and nozzles.

' 2. In a sand blast machine, the combination of a closed casing, a horizontally-reciprocatory frame extending through the top thereof, a blank-supporting shelf secured to said frame within the casing, a vertically-reciprocatory sand blast nozzle at each side of said shelf, coordinated mechanism for reciprocating said shelf and nozzles, and independent means foradjusting the range of reciprocation of each of said reciprocatory parts.

3.-In a sand blast machine, the combinationof a closed casing, a horizontal framecarrying track on top thereof, a frame mounted for reciprocation upon said track and extending through the casing top, a blank-supporting shelf secured to said frame within the casing, a verticallyreciprocatory sand blast nozzle at each side of said shelf, and coordinated mechanism outside of said casing for reciprocating said shelf and nozzles.

4;. In a sand blast machine, the combination of a closed casing a horizontally-reciprocatory frame extending through the top thereof, a detachable shelf secured to said frame within the casing and provided with means for holding a plurality of blanks, a vertically-reciprocatory sand blast nozzle at each side of said shelf, and coordinated mechanism outside of said casing for re ciprocating said shelf and nozzles.

5. In a sand blast machine, the combination of a closed casing provided with supply sand bins at opposite sides thereof and with a spent-sand bin between said supply bins, a door in the lower portion of the casing wall at the end of said spent-sand bin, the floor of said spent-sand bin being inclined toward said door, a horizontally-reciprocatory blank holder above said spent-sand bin, a vertically-reciprocatory sand blast nozzle at each side of said blank holder and above said supply bins, and coordinated means for reciprocating said blank holder and nozzles.

In testimony whereof I have hereunto set my hand.

JOHN L. DAIVES.

Witnesses PAUL N. CmroHLoW, FRANCIS J. TOMASSON.

Espfies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, B. G. 

